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Need one tire (back order)

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I have the same thing and my car only has 1,000 miles on it. Made a service appointment via the Tesla app and chatted with the service advisor. He said that in order to get a warranty replacement (since there are no impact marks), it would take supervisor approval. So he squeezed me in this Sunday and I'll see what they say.
 
UPDATE: I took it to the Service Center and they changed their tune a bit. They basically said any sidewall bubble is usually caused by a road hazard and it would have to be customer pay. I am going to file a warranty claim with Michelin as a last ditch effort... I don't have high hopes that they'll cover it. But I do understand Tesla not wanting to get involved in that as they don't warranty the tire.

On the plus side, their cost for the 265/35/21 Michelin PS4 was $350 plus $49 for M&B. The cheapest I could find locally was $475 just for the tire and all local places were out of stock. So at least they had a decent price for the replacement.